The Pypes SJJ21S is a Street Pro cat-back exhaust system for the 2007-2018 Jeep Wrangler JK in both 2-door and 4-door configurations. It is built from 409 stainless steel with 2.5 inch tubing and a single rear exit routed for high ground clearance on the trail. The Street Pro muffler delivers a moderate sound improvement over the stock system while staying daily-driver friendly. As an after-cat system it works with the factory catalytic converters and keeps the Jeep street legal.
- Type: Cat-Back Exhaust System (after-cat)
- Series: Street Pro
- Material: 409 stainless steel
- Diameter: 2.5 in
- Muffler: Street Pro
- Exit: Single rear exit
- Tip: Downturn tip (not included)
- Routing: High ground clearance
- Fits: 2007-2018 Jeep Wrangler JK, 2-door and 4-door
- Sold as: Complete cat-back kit
- Part number: SJJ21S
Vehicle Applications
- 2007 Jeep Wrangler JK 2 Door
- 2007 Jeep Wrangler JK 4 Door
- 2008 Jeep Wrangler JK 2 Door
- 2008 Jeep Wrangler JK 4 Door
- 2009 Jeep Wrangler JK 2 Door
- 2009 Jeep Wrangler JK 4 Door
- 2010 Jeep Wrangler JK 2 Door
- 2010 Jeep Wrangler JK 4 Door
- 2011 Jeep Wrangler JK 2 Door
- 2011 Jeep Wrangler JK 4 Door
- 2012 Jeep Wrangler JK 2 Door
- 2012 Jeep Wrangler JK 4 Door
- 2013 Jeep Wrangler JK 2 Door
- 2013 Jeep Wrangler JK 4 Door
- 2014 Jeep Wrangler JK 2 Door
- 2014 Jeep Wrangler JK 4 Door
- 2015 Jeep Wrangler JK 2 Door
- 2015 Jeep Wrangler JK 4 Door
- 2016 Jeep Wrangler JK 2 Door
- 2016 Jeep Wrangler JK 4 Door
- 2017 Jeep Wrangler JK 2 Door
- 2017 Jeep Wrangler JK 4 Door
- 2018 Jeep Wrangler JK 2 Door
- 2018 Jeep Wrangler JK 4 Door
FAQ
Does the Pypes SJJ21S fit both 2-door and 4-door Wrangler JK models?
Yes. The SJJ21S is engineered for the 2007-2018 Jeep Wrangler JK in both the 2-door and 4-door body styles.
Is the Pypes SJJ21S street legal?
Yes. It is an after-cat cat-back system that retains the factory catalytic converters, so it is street legal in most areas.
What material and diameter is the SJJ21S?
It uses 2.5 inch 409 stainless steel tubing with a Street Pro muffler and a single rear exit.
How does the SJJ21S sound?
The Street Pro muffler gives a moderate sound improvement over stock with a tone that stays comfortable for daily driving.
Does the SJJ21S help with ground clearance off-road?
Yes. The exhaust is routed for high ground clearance and uses a downturn tip to help maintain clearance on the trail.